After review remarks by @earlephilhower

Author: dok-net

cores/esp8266/Updater.cpp

@@ -11,8 +11,8 @@
 
 #if ARDUINO_SIGNING
 namespace esp8266 {
-  extern UpdaterHashClass& hash;
-  extern UpdaterVerifyClass& sign;
+  extern UpdaterHashClass& updaterSigningHash;
+  extern UpdaterVerifyClass& updaterSigningVerifier;
 }
 #endif
 
@@ -38,7 +38,7 @@ UpdaterClass::UpdaterClass()
 , _progress_callback(nullptr)
 {
 #if ARDUINO_SIGNING
-  installSignature(&esp8266::hash, &esp8266::sign);
+  installSignature(&esp8266::updaterSigningHash, &esp8266::updaterSigningVerifier);
 #endif
 }
 

libraries/ESP8266WiFi/src/BearSSLHelpers.cpp

@@ -908,14 +908,14 @@ make_stack_thunk(br_ssl_engine_sendrec_buf);
 
 #if ARDUINO_SIGNING
 namespace {
-  static BearSSL::PublicKey signPubKey(signing_pubkey);
-  static BearSSL::HashSHA256 __hash;
-  static BearSSL::SigningVerifier __sign(&signPubKey);
+  static BearSSL::PublicKey signingPubKey(signing_pubkey);
+  static BearSSL::HashSHA256 __signingHash;
+  static BearSSL::SigningVerifier __signingVerifier(&signingPubKey);
 };
 
 namespace esp8266 {
-  UpdaterHashClass& hash = __hash;
-  UpdaterVerifyClass& sign = __sign;
+  UpdaterHashClass& updaterSigningHash = __signingHash;
+  UpdaterVerifyClass& updaterSigningVerifier = __signingVerifier;
 };
 #endif